EP1974098B1 - Formgebungswerkzeug zum erzeugen von faserobjekten - Google Patents

Formgebungswerkzeug zum erzeugen von faserobjekten Download PDF

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Publication number
EP1974098B1
EP1974098B1 EP07709419A EP07709419A EP1974098B1 EP 1974098 B1 EP1974098 B1 EP 1974098B1 EP 07709419 A EP07709419 A EP 07709419A EP 07709419 A EP07709419 A EP 07709419A EP 1974098 B1 EP1974098 B1 EP 1974098B1
Authority
EP
European Patent Office
Prior art keywords
tool
shell
forming tool
objects
permeable
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
Application number
EP07709419A
Other languages
English (en)
French (fr)
Other versions
EP1974098A1 (de
Inventor
Björn Nilsson
Lars Graffton
Leif BÅSKMAN
Robert Eriksson
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Pakit International Trading Co Inc
Original Assignee
Pakit International Trading Co Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Pakit International Trading Co Inc filed Critical Pakit International Trading Co Inc
Publication of EP1974098A1 publication Critical patent/EP1974098A1/de
Application granted granted Critical
Publication of EP1974098B1 publication Critical patent/EP1974098B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21J—FIBREBOARD; MANUFACTURE OF ARTICLES FROM CELLULOSIC FIBROUS SUSPENSIONS OR FROM PAPIER-MACHE
    • D21J7/00—Manufacture of hollow articles from fibre suspensions or papier-mâché by deposition of fibres in or on a wire-net mould

Definitions

  • the invention relates to a permeable forming tool for making fibre objects.
  • the forming tool is intended to be immersed in a fibre suspension or stock and an embryonic fibre product can then be formed on the tool through application of suction through the permeable tool.
  • Fibre products such as for example egg boxes can be made from stock in a process where a fibre layer is created and shaped to a desired form whereafter the so shaped fibre product is dewatered and possibly subjected to some form of post-processing operation.
  • US patent No. 6103179 discloses a method for producing a fibre product which is where a first male mould is immersed in a moulding tank containing stock. By means of vacuum, a fibre layer of predetermined thickness for the fibre product is formed. The first male mould is then removed from the moulding tank. A cyclical sequence of movements is performed with a female mould in which, in a first pressing stage, the female mould is brought under force against the male mould so that a first expressing of stock water occurs following which the fibre product is transferred to the female mould which is moved to a second position. The fibre product is then subjected to a second expressing whereafter the fibre product is subjected to final drying using microwave or IR radiation.
  • US patent No. 5603808 discloses a mould for making pulp mouldings that includes a reticulate resin mould part of a three-dimensional shape.
  • the resin mould part is metallized for reinforcement and mounted on a support member made of a resin, metal or aggregate.
  • the support member has substantially the same three-dimensional shape as that of the reticulate resin mould and has openings to discharge water from openings of the metallized resin mould part.
  • the support member has a body of coarse particles bound together to form a porous structure. The particles of the porous structure are bound together by a binder or by sintering them.
  • EP-A-0559490 discloses a forming tool for fibre objects which comprises a permeable shell of sintered particles.
  • forming tools for fibre objects be firm and strong such that they can withstand both underpressure and pressure that is caused by contact with counter-tools, for example during a pressing operation. It is also desirable that they have a sufficient permeability such that water may easily pass through the forming tools. In case fibres should accumulate inside a forming tool, it is also desirable that the tool can be cleaned from such fibres. It is also desirable that forming tools can be manufactured easily and at a low cost. With this in mind, the present invention has been developed in order to offer an improved forming tool for making fibre objects.
  • the invention relates to a forming tool for fibre objects.
  • the inventive tool comprises a permeable shell of sintered particles.
  • the shell partially encloses an inner cavity of the tool which is filled with loose objects.
  • the tool further comprises a permeable cover that together with the permeable shell encloses the cavity such that the loose objects are enclosed between the cover and an inner wall of the shell.
  • the loose objects are spherical particles and they may be made of a plastic material.
  • the permeable shell of the forming tool has an outer surface that corresponds to a male forming tool.
  • the permeable cover may comprise a relatively stiff cover plate and a flexible net.
  • the stiff cover plate can be made of, for example, polyvinyl chloride.
  • the stiff cover plate has through-holes that are larger than the loose objects and the net has a mesh size that is smaller than the loose objects.
  • the particles in the sintered shell may have an average diameter within the range of 0,1 - 5 mm and suitably 0,1 mm - 2 mm.
  • the permeable cover may be removably attached to the permeable shell.
  • a process for making fibre objects is schematically illustrated.
  • a forming tool 1 is shown immersed in a fibre suspension 18 that is contained in a tank 17.
  • the tool 1 is a permeable tool 1 that is connected to a source 16 of underpressure or suction.
  • underpressure suction
  • a fibre object 2 can be formed on the outer surface of the tool 1 as indicated in Fig. 2 .
  • a forming tool I can be mounted on a tool holder 19 that can pivot about an axis 20.
  • the tool holder 19 may have an extendable arm 22 that allows the tool 1 to be moved into a tank 6 that contains a fibre suspension 18.
  • suction is applied to the tool 1
  • a fibre product 2 can be formed on the tool as indicated in Fig. 2 .
  • the tool 1 can be lifted up from the tank 6 as indicated in Figs. 4a - 4c .
  • the tool 1 can then be brought into contact with another tool 21 that can optionally be used for pressing water from the fibre product 2 in a nip formed between the tools 1 and 21.
  • the tool 21 may also be used exclusively as a pick-up tool that simply picks up the fibre product 2 and transfers it to another work station (for example a press nip).
  • the forming tool 1 comprises a permeable shell 3 of sintered particles 4.
  • the sintered particles 4 are preferably metal powder particles. Suitable particles for making such a shell can be obtained from, for example, Callo AB, with address Poppelgatan 15, S-571 39 N ⁇ SSJ ⁇ , SWEDEN. Callo AB sells metal powder particles having a chemical composition of 89% Cu and 11 % Sn and it is believed that such particles may be suitable for making a permeable shell of sintered particles.
  • Suitable particles can also be obtained from Makin Metal Powders Limited, Buckley Road, Rochdale, Lancashire OL12 9DT England. It should also be understood that the particles used to form the permeable shell 3 need not necessarily be based on copper. Other metal materials such as for example steel may also be considered. A steel material should preferably be a stainless steel material in order to better survive repeated exposure to water.
  • the shell may have a porosity that is suitably in the range of 8 - 40%.
  • the thickness of the permeable shell 3 may be, for example, in the range of 3 mm - 20 mm. However, it should be understood that embodiments may be envisaged where the thickness of the permeable shell 3 exceeds 20 mm or is less than 3 mm.
  • the thickness of the shell 3 may conceivably have a thickness of 25 mm, 30 mm or 35 mm.
  • the thickness may be somewhat smaller, for example in the range of 3 mm - 10 mm.
  • a thicker shell may be desired, for example a shell having a thickness in the range of 8 mm - 15 mm or 10 mm - 20 mm.
  • the shell 3 may, at least in principle, be provided with through-holes. However, is porous. This makes it possible for the shell to form an outer surface that is a continuous surface. This surface is permeable in itself because it is porous. By using a shell with a continuous surface, dewatering of the fibre product can be made uniform, i.e. the dryness of formed fibre product will be evenly distributed.
  • the particles in the sintered shell may have an average diameter within the range of 0,01 - 5mm, preferably 0,1 mm - 2 mm. However, it should be understood that particles outside this range may also be considered.
  • the permeable shell 3 may be formed by many different methods.
  • One way of forming such a shell 3 may include the use of a basic model tool having an exterior shape that corresponds to the shell 3 to be produced. Powder particles can then be applied onto the basic model to form a first layer. This can be repeated such that several layers of powder are formed on the basic model. The particles can then be heat treated, possible together with the basic model such that the particles form a sintered shell. The basic model can then be removed.
  • the sintering temperature may suitably be in the range of 800°C - 1000°C. If stainless steel particles are used, the sintering temperature may suitably be in the range of 1100°C - 1300°C.
  • the time required for the sintering process may typically be about 0.5 - 2 hours. Sintering may be performed in a sintering furnace containing an appropriate atmosphere, for example H 2 , H 2 + N 2 or vacuum.
  • the shell 3 partially encloses an inner cavity 5 which is filled with loose objects 6, i.e. a plurality of objects that are not bound to each other.
  • the enclosure is completed by a permeable cover 7 that together with the permeable shell 3 encloses the cavity 5.
  • the loose objects 6 are enclosed between the cover 7 and an inner wall 11 of the shell 3.
  • the loose objects 6 are spherical objects (i.e. shaped as spheres). If spherical objects are used, the passageways for the liquid will be of relatively uniform permeability which can improve performance of the tool 1. However, it should be understood that also other objects than spherical objects may be considered.
  • the loose objects 6 could be irregular objects or be shaped as regular polyhedrons._Preferably, although not necessarily, the loose objects 6 are made of a plastic material. Other possible materials for the loose objects 6 include, but are not restricted to, glass or metal. Thus, according to one embodiment of the invention, the loose objects could be spherical objects (balls) of a plastic material. In another embodiment, they could be irregular objects of a plastic material. In yet another embodiment, they could be decahedrons made of glass. It should be understood that these possibilities are mentioned only as examples of what can be envisaged. In many realistic and suitable embodiments of the invention, the loose objects may be about 5 mm - 25 mm. For example, they could be plastic spheres with a diameter of 5 mm - 25 mm. However, it should be understood that other dimensions are also possible
  • the permeable shell 3 partially encloses an inner cavity 5 and the shell may actually be shaped in such a way that it has a plurality of cavities 5 as is also indicated in Fig. 7 .
  • the cavities 5 correspond to bulges 27 that define male tools as indicated in Fig. 6 .
  • the outer surface 10 of the tool thus corresponds to a male forming tool (or several male forming tools).
  • the cavity 5 or cavities 5 are filled with loose objects 6 such as spheres 6.
  • inventive forming tool could also be shaped as a female tool.
  • the permeable cover 7 may comprise two parts, a relatively stiff cover plate 8 and a flexible net 9.
  • the term "relatively stiff” should be understood as meaning that the cover plate 8 is stiff compared to the net 9. In absolute terms, it may well have a degree of flexibility.
  • a possible material for the cover plate 8 may be polyvinyl chloride.
  • the net 9 may also be of a plastic material.
  • the stiff cover plate 8 may have through-holes 12 that are larger than the loose objects 6 and the net 9 has a mesh size that is smaller than the loose objects 6.
  • Fig. 10 the tool 1 is shown with the spheres 6 placed in the cavities 5 of the shell 3 and the net 3 placed over the cavities.
  • the flexible net 9 is used since the through-holes 12 in the cover plate 8 are so large that the loose objects 6 could pass through them.
  • the cover plate 8 can be used to fasten the tool to a tool plate.
  • the net 9 provides a high permeability without permitting the loose objects 6 to leave the cavity 5 while the relatively stiff cover plate 8 provides structural strength.
  • the permeable cover 7 may be removably attached to the permeable shell 3.
  • the cover 7 may be glued to the sintered shell 3 (alternatively, it may be removably attached to the shell 3).
  • a plurality of tools are shown mounted on a tool plate 15 that is permeable.
  • the tool plate 15 is further illustrated in Fig. 14 .
  • the tool plate can have openings 25 in which guide pins can be inserted to secure the tools 1 in a correct position on the tool plate 15.
  • the tools 1 can be fastened on the tool plate 15 by means of, for example, screws 23.
  • Fig, 16 shows how a guide pin 24 is used to ensure a correct relative position between the tool 1 and the tool plate 15. This is especially important when the tool 1 is mounted on the tool plate 1.
  • four tools may be placed on each tool plate 15.
  • each tool In order to mount the tools 1 on the tool plates 15, each tool may be guided by three guide pins 24 or centre pins 24, one pin 24 at the centre of the tool and one close to each end. Each tool may be mounted on the tool plate 15 using screws 23. After the mounting of the tools on the tool plates, the edges of the tools which are in contact with the tool plate 15 may optionally be sealed. Sealing can be achieved by, for example, high temperature silicone, e.g. Loctite 5920.
  • the tool plates can later be mounted on a forming unit.
  • the forming tool could have such dimensions that are suitable for forming fibre objects that are 20 mm - 150 mm deep and 60 mm - 150 mm wide.
  • the depth could be less than 20 mm and more than 150 mm.
  • the width of the fibre objects could of course be more than 150 mm. For example, they could very well be up to 220 mm wide or even more. Both regular and irregular objects may be shaped.
  • Fig. 18 shows an embodiment where a tool 1 has a surface that has been painted or covered with an impermeable cover such that the tool 1 has an impermeable part 26.
  • a tool 1 can be used to form a fibre object having an opening corresponding to the shape of the impermeable part 26. This particular feature can be used regardless of how the forming tool 1 is otherwise designed.
  • the invention offers several advantages.
  • the loose objects 6 serve to support the shell 3 when the tool is used. This makes the tool stiffer and reduces the risk that the tool 1 is deformed during use.
  • the loose objects 6 provide good permeability. Especially spherical objects 6 result in a very good permeability. Since the loose objects 6 are not bound to each other, permeability is better compared to a design where with objects bound to each other.
  • the use of loose objects (such as loose spheres) also entails the advantage that it becomes easier to manufacture the forming tool. It is not necessary to manufacture a special support for shells of different shape since the loose objects will fill any shell.
  • the design according to the present invention makes it easier to clean the tool, especially of the cover 7 is removable.
  • the cover 7 is removed, the spheres 6 taken out and washed.
  • the inner cavity 5 is also washed and the spheres 6 can then be out back and the cover 7 applied again.
  • the invention could also be defined in terms of a use for the inventive tool where the tool is used to form fibre objects, i.e. a method for forming fibre objects.
  • a method for forming fibre objects may include cleaning the tool as described above, for example by operating the tool for a period of time to form fibre objects and then removing and cleaning the tool. The tool is then once again used to forms new objects.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Food-Manufacturing Devices (AREA)
  • Powder Metallurgy (AREA)
  • Pens And Brushes (AREA)
  • Inorganic Fibers (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
  • Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Manufacture Of Alloys Or Alloy Compounds (AREA)

Claims (9)

  1. Formwerkzeug (1) für Fasergegenstände, wobei das Werkzeug (1) eine durchlässige Schale (3) aus gesinterten Partikeln (4) umfasst, wobei die Schale (3) einen inneren Hohlraum (5) des Werkzeugs (1) teilweise umschließt, der mit losen Gegenständen (6) gefüllt ist, und das Werkzeug (1) eine durchlässige Abdeckung (7) umfasst, die zusammen mit der durchlässigen Schale (3) den Hohlraum (5) so umschließt, dass die losen Gegenstände (6) zwischen der Abdeckung (7) und einer Innenwand (11) der Schale (3) eingeschlossen sind.
  2. Formwerkzeug (1) gemäß Anspruch 1, wobei die losen Gegenstände (6) kugelförmige Partikel sind.
  3. Formwerkzeug (1) gemäß Anspruch 1 oder 2, wobei die losen Gegenstände (6) aus einem Kunststoffmaterial gefertigt sind.
  4. Formwerkzeug (1) gemäß Anspruch 1, wobei die durchlässige Schale (3) des Formwerkzeugs (1) eine äußere Oberfläche (10) aufweist, die einem Positiv-Formwerkzeug (1) entspricht.
  5. Formwerkzeug (1) gemäß Anspruch 1, wobei die durchlässige Abdeckung (7) eine relativ steife Abdeckungsplatte (8), und ein flexibles Netz (9) umfasst.
  6. Formwerkzeug (1) gemäß Anspruch 5, wobei die steife Abdeckungsplatte (8), aus Polyvinylchlorid hergestellt ist.
  7. Formwerkzeug (1) gemäß Anspruch 5, wobei die steife Abdeckungsplatte (8) Durchgangslöcher (12) aufweist, die größer sind, als die losen Gegenstände (6), und wobei das Netz (9) eine Maschenweite aufweist, die kleiner ist, als die losen Gegenstände (6).
  8. Formwerkzeug (1) gemäß Anspruch 1, wobei die Partikel (4) in der gesinterten Schale einen durchschnittlichen Durchmesser im Bereich von 0,01- 5 mm aufweisen.
  9. Formwerkzeug (1) gemäß Anspruch 1, wobei die durchlässige Abdeckung (7) lösbar an der durchlässigen Schale (3) befestigt ist.
EP07709419A 2006-01-18 2007-01-17 Formgebungswerkzeug zum erzeugen von faserobjekten Not-in-force EP1974098B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE0600108A SE529627C2 (sv) 2006-01-18 2006-01-18 Formningsverktyg för tillverkning av fiberföremål
PCT/SE2007/050026 WO2007084067A1 (en) 2006-01-18 2007-01-17 A forming tool for making fibre objects

Publications (2)

Publication Number Publication Date
EP1974098A1 EP1974098A1 (de) 2008-10-01
EP1974098B1 true EP1974098B1 (de) 2010-04-21

Family

ID=38287915

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07709419A Not-in-force EP1974098B1 (de) 2006-01-18 2007-01-17 Formgebungswerkzeug zum erzeugen von faserobjekten

Country Status (8)

Country Link
US (1) US7878787B2 (de)
EP (1) EP1974098B1 (de)
CN (1) CN101370982B (de)
AT (1) ATE465299T1 (de)
DE (1) DE602007005976D1 (de)
ES (1) ES2344810T3 (de)
SE (1) SE529627C2 (de)
WO (1) WO2007084067A1 (de)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DK2198088T3 (da) * 2007-09-14 2019-10-21 Natural Resources 2000 Ltd Fremgangsmåde og maskine til formning af en støbt artikel
SE534319C2 (sv) * 2009-11-13 2011-07-05 Pakit Int Trading Co Inc Massaform försedd med impermeabel yttre area
US8584589B2 (en) * 2010-03-18 2013-11-19 Jakks Pacific, Inc. Dehydrated, pulp-based projectile
EP3237680B1 (de) 2014-12-22 2020-01-15 Celwise AB Verfahren zur formung eines produkts aus einer faserstoffsuspension und werkzeug oder werkzeugteil zur verwendung in einem solchen verfahren

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US2903062A (en) * 1955-09-16 1959-09-08 Central Fibre Products Company Pulp-molding dies
US3284284A (en) * 1964-03-12 1966-11-08 Diamond Int Corp Controlled deposition pulp molding method and apparatus
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Also Published As

Publication number Publication date
CN101370982B (zh) 2012-01-25
SE529627C2 (sv) 2007-10-09
WO2007084067A1 (en) 2007-07-26
DE602007005976D1 (de) 2010-06-02
ES2344810T3 (es) 2010-09-07
CN101370982A (zh) 2009-02-18
US20080279976A1 (en) 2008-11-13
US7878787B2 (en) 2011-02-01
SE0600108L (sv) 2007-07-19
ATE465299T1 (de) 2010-05-15
EP1974098A1 (de) 2008-10-01

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